单项选择题

Brushing your teeth regularly helps to ward ______ tooth decay.

A．down
B．against
C．off
D．away
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单项选择题
Excessive use of antibiotics is the chief cause of deafness and ______ muteness in children.
A．subsequent
B．continuous
C．consequent
D．successive
单项选择题
A．proceedsB．precedesC．processesD．progresses
A．proceeds
B．precedes
C．processes
D．progresses
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